UI nitpick

Hi,

git-reset is really neat when you messed something up, but it spews messages.

  [lilydev@haring lilypond]$ git-reset  HEAD
  lily/accidental-engraver.cc: needs update
  lily/lyric-combine-music-iterator.cc: needs update

this makes me think that the reset was unsuccesful.

After a few more experiments with 

  git-reset <stuff> HEAD^ 

I started noticing that the list grew longer and longer.

It would be nice if git-reset printed 

 HEAD is now <sha1> - <excerpt of commit message>